Thread-case for sewing machines



1933- G. A. FLECKENSTEIN 1,931,456

THREAD CASE FOR SEWING MACHINES Filed NOV. 12, 1931 GeoI yc s4-Heckensfez'n Patented Oct. 17, 1933 UNlTED- STATES THREAD-"CASE 7 GeorgeA. Fleckenstein, Stratford, Conn., assignor to The Singer ManufacturingCompany, Elizabeth, N. J., a corporation of New Jersey ApplicationNovember 12, 1931 Serial No. 574,578

3 Claims. (01. 112-231) This invention relates to thread-cases aroundwhich needle-thread loops are cast by sewing machine loop-takers and hasfor its object to provide an improved thread-case so formed that thebobbin may be readily and easily removed.

With the above and other objects in view, as

will hereinafter appear, the invention consists in the combination, andarrangement of parts hereinafter set forth and illustrated in theaccompanying drawing of a preferred embodiment of the invention, fromwhich the several features of the invention and the advantages attainedthereby will be readily understood by those skilled in the art. 15 Inthe accompanying drawing:

Figure 1 is a rear elevation showing a rotary lock-stitch hook and theimproved thread-case in operative relation.

Figure 2 is a substantially central, vertical section of thethread-case, and shows the bobbin in different positions of removaltherefrom.

Figure 3 is a perspective view of the threadcase.

The looptaker shown in the accompanying drawing is of the vertical-axistype for cooperation with a reciprocating needle 1. The looptaker, whichhas a base 2 and is cupped to form a cylindrical side wall 3, isprovided with the usual downwardly extending stem 4, the free end ofwhich is adapted to be engaged by the usual hook-driving mechanism ofthe high speed Singer vertical-axis hook machine. The looptaker isprovided with the usual loop-seizing beak I 5 and raceway 6.

The thread-case is cup-shaped, open at its top, and has no postprojecting from its base. It is provided with the usual annularbearing-rib 7 which is journaled in the raceway 6 of the book. Thethread-case is formed with a bobbin-sup- 40 porting base 8 having anupstanding cylindrical wall 9. The wall 9 is provided in its upper edgeand on its rearward side with a finger-notch or recess 10 extending downbelow the upper flange of the bobbin 11. At a point diametricallyopposite the finger-notch 10, the upper and inner edge of the wall 9 isbeveled, as shown at 12, so that the upper flange of the bobbin willmove over the bevel and readily tilt over the wall when a slight upwardpressure is applied to the bobbin at the finger-notch 10.

The. wall 9 of the thread-case below the beveled edge 12 is providedwith an inclined thread-slit l3 terminating close to the base 8 in athreadaperture 14. The location of the thread-aperture 14 tends toprevent the bobbin 11 from rising above the thread-case. Secured to thewall 9 by the screw 15 is the usual adjustable tensionspring 16 with itsbifurcated end 17 extending over the aperture 18in the wall 9 of thethreadcase. The wall 9 of the thread-case has projecting therefrom theusual rotation-restraining lug 19 which engages the throat-plate of themachine (not shown) to prevent the thread-case from rotating.

To remove the bobbin, a slight upward pressure is applied to the upperflange of the bobbin 11 exposed by the finger-notch 10, preferably bythe index finger. This causes the upper flange of the bobbin, at apointdiametrically opposite where the pressure is applied, to move over thebeveled surface 12, and pass through the three positions A, B, and C,seriatum, asshown in Figure 2. When the bobbin reaches substantially theposition indicated at C, it may be firmly grasped by the thumb andsecond finger and lifted from the thread-case. It will be observed thatthe thread-aperture 14 is directly under the'beveled edge 12 anddiametrically opposite the finger-notch 10, consequently the initialtilting'movement of the bobbin occasions no drawing of the threadthrough the tensions. Therefore, the tension imposes no resistance tothe initial tilting of the bobbin. Furthermore, the slight drag placedon the thread by reason of the posi- .the opposite side of' thethread-case from the operator. This location permits the index finger tobe used when tilting the bobbin, thus, facili tating removal.

Having thus set forth the nature of the invention, what I claim hereinis:--

1. In a sewing machine, .the combination with a reciprocatory needle, ofa hook-member circularly movable upon a vertical axis, an opentoppedthread-case disposed within said hookmember and having an annularside-wall defining a bobbin cavity which is free of projections, and adisk-bobbin having spaced upper and lower thread-confining flangeswithin said bobbin cavity, the upper edge of the wall of said threadcasebeing formed with a bobbin-flange-exposing finger-notch, and said upperedge being beveled outwardly substantially diametrically opposite saidfinger-notch at a point substantially level with the upper flange of thebobbin, whereby the bobbin may be tilted over the edge or said threadastantially diametrically opposite said fingernotch.

3. In a sewing machine, the combination with a reciprocatory needle, of.a loop-taker circularly V movable upon a vertical axis, an open-toppedthread-case disposed within said loop-taker and having an annularside-wall defining a bobbincavity which is free of projections, and adiskbobbin within said cavity, the wall of said threadcase having in itsupper edge a single bobbinfiange-exposing finger-notch and adiametrically vopposite portion inwardly beveled, and said wall having athread-aperture at a point below said beveled portion.

GEORGE A. FLECKENSTEIN.

